A Cobb County homeowner may dispute the assessment shown on the annual Notice of Assessment by filing with the Cobb County Board of Tax Assessors within the notice's 45-day window. The notice deadline is the operative date, not the tax-bill due date and not a date copied from another Georgia county. Cobb encourages electronic filing and also accepts timely mail and in-person submissions. The initial filing can identify value, uniformity, taxability, or another recognized ground and select the applicable review route. FairPath currently provides county links and a guided manual way to organize owner-selected facts and evidence; it does not claim to calculate a Cobb result, sell an automated packet, or file for the owner.
Assessment context: Start with Cobb's official assessor search and verify the parcel identification, situs address, land, building characteristics, exemptions, prior values, and current notice. Cobb includes established Marietta and Smyrna neighborhoods, east-county housing, and newer suburban development, so age, renovation, lot, school context, and immediate market area can materially affect comparison quality. ACS 2024 five-year data reports a $407,200 median value for owner-occupied housing and roughly 69 percent of county housing built before 2000. Those statistics describe the county, not a subject value. Older housing makes accurate effective age, remodeling, deferred maintenance, and county-record corrections particularly useful to inspect before selecting sales or assessment comparisons.
Filing process: Use the deadline printed on the 2026 notice. Cobb's official communications direct owners to electronic submission through the assessor website, allow mailed appeals when postmarked by the deadline, and accept in-person delivery at 736 Whitlock Avenue, Suite 200 in Marietta. A complete submission should identify the parcel, owner, disputed value or ground, requested review route, and supporting explanation; follow the current portal and form prompts rather than relying on an old copy. Save the notice, submitted form, attachment list, timestamp, postal tracking, or stamped receipt. Contacting an appraiser or attending an assistance session can clarify records, but it should not be treated as an appeal unless the county confirms a completed filing.
Evidence to review: A Cobb evidence file is more defensible when every item answers a specific valuation question. For recent sales, record address, parcel, sale date, price, living area, age, lot, and meaningful differences. For uniformity, compare county assessments for properties that share use and physical characteristics, not merely nearby addresses. Condition evidence may include dated photographs, inspection reports, contractor estimates, permit history, or records of unrepaired damage that existed near the valuation date. If Cobb's parcel record lists the wrong square footage, construction, basement, bath count, or improvement, pair the disputed field with a reliable owner document. Organize exhibits with source dates and captions. The homeowner decides relevance and submits directly; FairPath does not promise acceptance or a reduction.
Current deadline guidance: 45 days from the date on the 2026 assessment notice. Georgia's 45-day appeal period applies to Cobb annual assessment notices. The last day to appeal is printed on the property's notice; because notices control parcel timing, do not substitute a general calendar date.
Cobb's deadline is notice-specific. Electronic filing provides a timestamp, mailed filing depends on a timely postmark, and in-person filing can provide a receipt. Choose a method that leaves evidence of submission and do not wait for a general county reminder.
Cobb's official GIS property search can help confirm parcel boundaries and location context separately from the assessor's valuation record. When a parcel has an unusual shape, multiple improvements, or adjacency influence, preserve both map and record views with retrieval dates.
The annual assessment notice is distinct from a tax bill. A challenge addresses assessed facts or value; millage rates and final tax calculations arise through separate processes. Keep market value, assessed value, exemptions, and estimated taxes in labeled columns.
Cobb's varied housing eras make broad price-per-square-foot comparisons weak without adjustments. A renovated east Cobb home, an older Marietta property, and recent construction may share a ZIP code while differing in effective age and market appeal.
Official filing authority: Cobb County Board of Tax Assessors. https://assessor.cobbcounty.gov/
Source: Cobb County Board of Tax Assessors, Cobb County Tax Assessor, https://assessor.cobbcounty.gov/. Reviewed 2026-07-15.
Source: Cobb County Government, Cobb County GIS Property Search, https://gis.cobbcounty.gov/PropertySearch.html. Reviewed 2026-07-15.
Source: Georgia Department of Revenue, PT-311A Appeal of Assessment Form, https://dor.georgia.gov/pt-311a-appeal-assessment-form. Reviewed 2026-07-15.